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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd26b93d95bad2351a4e7e1219bfe85368ab132bccf236f4a1600a48c52d90b' 
  AND token = 'T6ch1rU5rjZB3CNYI5nMdQ9F6jA7/hDqu3i3Nz+z9jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}